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{"files":{"Cargo.toml":"0c0e4da56f66c4f8a9c4c0934a4c00656d725376c3415306581345daff8f65a8","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"7576269ea71f767b99297934c0b2367532690f8c4badc695edf8e04ab6a1e545","README-crates.io.md":"b775991a01ab4a0a8de6169f597775319d9ce8178f5c74ccdc634f13a286b20c","README.rst":"9e58b67679ea85ee1809558b97a077c6f759c41129340e487f3d7ec00a2831e8","src/iterator.rs":"2dcf3e361961c2f8c0545b7e603c225d4f20cc994b37f6be56ff8b2089c2f8e0","src/lib.rs":"380fac9dafc163c7e9686532666fc96ce949dbae6e45b40a4897915e0a0d68dd","src/serde_untagged.rs":"e826ee0ab31616e49c3e3f3711c8441001ee424b3e7a8c4c466cfcc4f8a7701a","src/serde_untagged_optional.rs":"86265f09d0795428bb2ce013b070d1badf1e2210217844a9ff3f04b2795868ab"},"package":"11157ac094ffbdde99aa67b23417ebdd801842852b500e395a45a9c0aac03e4a"}

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2018"
rust-version = "1.36"
name = "either"
version = "1.10.0"
authors = ["bluss"]
description = """
The enum `Either` with variants `Left` and `Right` is a general purpose sum type with two cases.
"""
documentation = "https://docs.rs/either/1/"
readme = "README-crates.io.md"
keywords = [
"data-structure",
"no_std",
]
categories = [
"data-structures",
"no-std",
]
license = "MIT OR Apache-2.0"
repository = "https://github.com/rayon-rs/either"
[package.metadata.docs.rs]
features = ["serde"]
[package.metadata.release]
no-dev-version = true
tag-name = "{{version}}"
[dependencies.serde]
version = "1.0"
features = ["derive"]
optional = true
[dev-dependencies.serde_json]
version = "1.0.0"
[features]
default = ["use_std"]
use_std = []

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Copyright (c) 2015
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The enum `Either` with variants `Left` and `Right` is a general purpose
sum type with two cases.
Either has methods that are similar to Option and Result, and it also implements
traits like `Iterator`.
Includes macros `try_left!()` and `try_right!()` to use for
short-circuiting logic, similar to how the `?` operator is used with `Result`.
Note that `Either` is general purpose. For describing success or error, use the
regular `Result`.

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Either
======
The enum ``Either`` with variants ``Left`` and ``Right`` and trait
implementations including Iterator, Read, Write.
Either has methods that are similar to Option and Result.
Includes convenience macros ``try_left!()`` and ``try_right!()`` to use for
short-circuiting logic.
Please read the `API documentation here`__
__ https://docs.rs/either/
|build_status|_ |crates|_
.. |build_status| image:: https://github.com/rayon-rs/either/workflows/CI/badge.svg?branch=main
.. _build_status: https://github.com/rayon-rs/either/actions
.. |crates| image:: https://img.shields.io/crates/v/either.svg
.. _crates: https://crates.io/crates/either
How to use with cargo::
[dependencies]
either = "1.10"
Recent Changes
--------------
- 1.10.0
- Add new methods ``.factor_iter()``, ``.factor_iter_mut()``, and ``.factor_into_iter()``
that return ``Either`` items, plus ``.iter()`` and ``.iter_mut()`` to convert to direct
referene iterators; by @aj-bagwell and @cuviper (#91)
- 1.9.0
- Add new methods ``.map_either()`` and ``.map_either_with()``, by @nasadorian (#82)
- 1.8.1
- Clarified that the multiple licenses are combined with OR.
- 1.8.0
- **MSRV**: ``either`` now requires Rust 1.36 or later.
- Add new methods ``.as_pin_ref()`` and ``.as_pin_mut()`` to project a
pinned ``Either`` as inner ``Pin`` variants, by @cuviper (#77)
- Implement the ``Future`` trait, by @cuviper (#77)
- Specialize more methods of the ``io`` traits, by @Kixunil and @cuviper (#75)
- 1.7.0
- **MSRV**: ``either`` now requires Rust 1.31 or later.
- Export the macro ``for_both!``, by @thomaseizinger (#58)
- Implement the ``io::Seek`` trait, by @Kerollmops (#60)
- Add new method ``.either_into()`` for ``Into`` conversion, by @TonalidadeHidrica (#63)
- Add new methods ``.factor_ok()``, ``.factor_err()``, and ``.factor_none()``,
by @zachs18 (#67)
- Specialize ``source`` in the ``Error`` implementation, by @thomaseizinger (#69)
- Specialize more iterator methods and implement the ``FusedIterator`` trait,
by @Ten0 (#66) and @cuviper (#71)
- Specialize ``Clone::clone_from``, by @cuviper (#72)
- 1.6.1
- Add new methods ``.expect_left()``, ``.unwrap_left()``,
and equivalents on the right, by @spenserblack (#51)
- 1.6.0
- Add new modules ``serde_untagged`` and ``serde_untagged_optional`` to customize
how ``Either`` fields are serialized in other types, by @MikailBag (#49)
- 1.5.3
- Add new method ``.map()`` for ``Either<T, T>`` by @nvzqz (#40).
- 1.5.2
- Add new methods ``.left_or()``, ``.left_or_default()``, ``.left_or_else()``,
and equivalents on the right, by @DCjanus (#36)
- 1.5.1
- Add ``AsRef`` and ``AsMut`` implementations for common unsized types:
``str``, ``[T]``, ``CStr``, ``OsStr``, and ``Path``, by @mexus (#29)
- 1.5.0
- Add new methods ``.factor_first()``, ``.factor_second()`` and ``.into_inner()``
by @mathstuf (#19)
- 1.4.0
- Add inherent method ``.into_iter()`` by @cuviper (#12)
- 1.3.0
- Add opt-in serde support by @hcpl
- 1.2.0
- Add method ``.either_with()`` by @Twey (#13)
- 1.1.0
- Add methods ``left_and_then``, ``right_and_then`` by @rampantmonkey
- Include license files in the repository and released crate
- 1.0.3
- Add crate categories
- 1.0.2
- Forward more ``Iterator`` methods
- Implement ``Extend`` for ``Either<L, R>`` if ``L, R`` do.
- 1.0.1
- Fix ``Iterator`` impl for ``Either`` to forward ``.fold()``.
- 1.0.0
- Add default crate feature ``use_std`` so that you can opt out of linking to
std.
- 0.1.7
- Add methods ``.map_left()``, ``.map_right()`` and ``.either()``.
- Add more documentation
- 0.1.3
- Implement Display, Error
- 0.1.2
- Add macros ``try_left!`` and ``try_right!``.
- 0.1.1
- Implement Deref, DerefMut
- 0.1.0
- Initial release
- Support Iterator, Read, Write
License
-------
Dual-licensed to be compatible with the Rust project.
Licensed under the Apache License, Version 2.0
https://www.apache.org/licenses/LICENSE-2.0 or the MIT license
https://opensource.org/licenses/MIT, at your
option. This file may not be copied, modified, or distributed
except according to those terms.

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use super::{for_both, Either, Left, Right};
use core::iter;
macro_rules! wrap_either {
($value:expr => $( $tail:tt )*) => {
match $value {
Left(inner) => inner.map(Left) $($tail)*,
Right(inner) => inner.map(Right) $($tail)*,
}
};
}
/// Iterator that maps left or right iterators to corresponding `Either`-wrapped items.
///
/// This struct is created by the [`Either::factor_into_iter`],
/// [`factor_iter`][Either::factor_iter],
/// and [`factor_iter_mut`][Either::factor_iter_mut] methods.
#[derive(Clone, Debug)]
pub struct IterEither<L, R> {
inner: Either<L, R>,
}
impl<L, R> IterEither<L, R> {
pub(crate) fn new(inner: Either<L, R>) -> Self {
IterEither { inner }
}
}
impl<L, R, A> Extend<A> for Either<L, R>
where
L: Extend<A>,
R: Extend<A>,
{
fn extend<T>(&mut self, iter: T)
where
T: IntoIterator<Item = A>,
{
for_both!(*self, ref mut inner => inner.extend(iter))
}
}
/// `Either<L, R>` is an iterator if both `L` and `R` are iterators.
impl<L, R> Iterator for Either<L, R>
where
L: Iterator,
R: Iterator<Item = L::Item>,
{
type Item = L::Item;
fn next(&mut self) -> Option<Self::Item> {
for_both!(*self, ref mut inner => inner.next())
}
fn size_hint(&self) -> (usize, Option<usize>) {
for_both!(*self, ref inner => inner.size_hint())
}
fn fold<Acc, G>(self, init: Acc, f: G) -> Acc
where
G: FnMut(Acc, Self::Item) -> Acc,
{
for_both!(self, inner => inner.fold(init, f))
}
fn for_each<F>(self, f: F)
where
F: FnMut(Self::Item),
{
for_both!(self, inner => inner.for_each(f))
}
fn count(self) -> usize {
for_both!(self, inner => inner.count())
}
fn last(self) -> Option<Self::Item> {
for_both!(self, inner => inner.last())
}
fn nth(&mut self, n: usize) -> Option<Self::Item> {
for_both!(*self, ref mut inner => inner.nth(n))
}
fn collect<B>(self) -> B
where
B: iter::FromIterator<Self::Item>,
{
for_both!(self, inner => inner.collect())
}
fn partition<B, F>(self, f: F) -> (B, B)
where
B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,
{
for_both!(self, inner => inner.partition(f))
}
fn all<F>(&mut self, f: F) -> bool
where
F: FnMut(Self::Item) -> bool,
{
for_both!(*self, ref mut inner => inner.all(f))
}
fn any<F>(&mut self, f: F) -> bool
where
F: FnMut(Self::Item) -> bool,
{
for_both!(*self, ref mut inner => inner.any(f))
}
fn find<P>(&mut self, predicate: P) -> Option<Self::Item>
where
P: FnMut(&Self::Item) -> bool,
{
for_both!(*self, ref mut inner => inner.find(predicate))
}
fn find_map<B, F>(&mut self, f: F) -> Option<B>
where
F: FnMut(Self::Item) -> Option<B>,
{
for_both!(*self, ref mut inner => inner.find_map(f))
}
fn position<P>(&mut self, predicate: P) -> Option<usize>
where
P: FnMut(Self::Item) -> bool,
{
for_both!(*self, ref mut inner => inner.position(predicate))
}
}
impl<L, R> DoubleEndedIterator for Either<L, R>
where
L: DoubleEndedIterator,
R: DoubleEndedIterator<Item = L::Item>,
{
fn next_back(&mut self) -> Option<Self::Item> {
for_both!(*self, ref mut inner => inner.next_back())
}
// TODO(MSRV): This was stabilized in Rust 1.37
// fn nth_back(&mut self, n: usize) -> Option<Self::Item> {
// for_both!(*self, ref mut inner => inner.nth_back(n))
// }
fn rfold<Acc, G>(self, init: Acc, f: G) -> Acc
where
G: FnMut(Acc, Self::Item) -> Acc,
{
for_both!(self, inner => inner.rfold(init, f))
}
fn rfind<P>(&mut self, predicate: P) -> Option<Self::Item>
where
P: FnMut(&Self::Item) -> bool,
{
for_both!(*self, ref mut inner => inner.rfind(predicate))
}
}
impl<L, R> ExactSizeIterator for Either<L, R>
where
L: ExactSizeIterator,
R: ExactSizeIterator<Item = L::Item>,
{
fn len(&self) -> usize {
for_both!(*self, ref inner => inner.len())
}
}
impl<L, R> iter::FusedIterator for Either<L, R>
where
L: iter::FusedIterator,
R: iter::FusedIterator<Item = L::Item>,
{
}
impl<L, R> Iterator for IterEither<L, R>
where
L: Iterator,
R: Iterator,
{
type Item = Either<L::Item, R::Item>;
fn next(&mut self) -> Option<Self::Item> {
Some(map_either!(self.inner, ref mut inner => inner.next()?))
}
fn size_hint(&self) -> (usize, Option<usize>) {
for_both!(self.inner, ref inner => inner.size_hint())
}
fn fold<Acc, G>(self, init: Acc, f: G) -> Acc
where
G: FnMut(Acc, Self::Item) -> Acc,
{
wrap_either!(self.inner => .fold(init, f))
}
fn for_each<F>(self, f: F)
where
F: FnMut(Self::Item),
{
wrap_either!(self.inner => .for_each(f))
}
fn count(self) -> usize {
for_both!(self.inner, inner => inner.count())
}
fn last(self) -> Option<Self::Item> {
Some(map_either!(self.inner, inner => inner.last()?))
}
fn nth(&mut self, n: usize) -> Option<Self::Item> {
Some(map_either!(self.inner, ref mut inner => inner.nth(n)?))
}
fn collect<B>(self) -> B
where
B: iter::FromIterator<Self::Item>,
{
wrap_either!(self.inner => .collect())
}
fn partition<B, F>(self, f: F) -> (B, B)
where
B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,
{
wrap_either!(self.inner => .partition(f))
}
fn all<F>(&mut self, f: F) -> bool
where
F: FnMut(Self::Item) -> bool,
{
wrap_either!(&mut self.inner => .all(f))
}
fn any<F>(&mut self, f: F) -> bool
where
F: FnMut(Self::Item) -> bool,
{
wrap_either!(&mut self.inner => .any(f))
}
fn find<P>(&mut self, predicate: P) -> Option<Self::Item>
where
P: FnMut(&Self::Item) -> bool,
{
wrap_either!(&mut self.inner => .find(predicate))
}
fn find_map<B, F>(&mut self, f: F) -> Option<B>
where
F: FnMut(Self::Item) -> Option<B>,
{
wrap_either!(&mut self.inner => .find_map(f))
}
fn position<P>(&mut self, predicate: P) -> Option<usize>
where
P: FnMut(Self::Item) -> bool,
{
wrap_either!(&mut self.inner => .position(predicate))
}
}
impl<L, R> DoubleEndedIterator for IterEither<L, R>
where
L: DoubleEndedIterator,
R: DoubleEndedIterator,
{
fn next_back(&mut self) -> Option<Self::Item> {
Some(map_either!(self.inner, ref mut inner => inner.next_back()?))
}
// TODO(MSRV): This was stabilized in Rust 1.37
// fn nth_back(&mut self, n: usize) -> Option<Self::Item> {
// Some(map_either!(self.inner, ref mut inner => inner.nth_back(n)?))
// }
fn rfold<Acc, G>(self, init: Acc, f: G) -> Acc
where
G: FnMut(Acc, Self::Item) -> Acc,
{
wrap_either!(self.inner => .rfold(init, f))
}
fn rfind<P>(&mut self, predicate: P) -> Option<Self::Item>
where
P: FnMut(&Self::Item) -> bool,
{
wrap_either!(&mut self.inner => .rfind(predicate))
}
}
impl<L, R> ExactSizeIterator for IterEither<L, R>
where
L: ExactSizeIterator,
R: ExactSizeIterator,
{
fn len(&self) -> usize {
for_both!(self.inner, ref inner => inner.len())
}
}
impl<L, R> iter::FusedIterator for IterEither<L, R>
where
L: iter::FusedIterator,
R: iter::FusedIterator,
{
}

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//! Untagged serialization/deserialization support for Either<L, R>.
//!
//! `Either` uses default, externally-tagged representation.
//! However, sometimes it is useful to support several alternative types.
//! For example, we may have a field which is generally Map<String, i32>
//! but in typical cases Vec<String> would suffice, too.
//!
//! ```rust
//! # fn main() -> Result<(), Box<dyn std::error::Error>> {
//! use either::Either;
//! use std::collections::HashMap;
//!
//! #[derive(serde::Serialize, serde::Deserialize, Debug)]
//! #[serde(transparent)]
//! struct IntOrString {
//! #[serde(with = "either::serde_untagged")]
//! inner: Either<Vec<String>, HashMap<String, i32>>
//! };
//!
//! // serialization
//! let data = IntOrString {
//! inner: Either::Left(vec!["Hello".to_string()])
//! };
//! // notice: no tags are emitted.
//! assert_eq!(serde_json::to_string(&data)?, r#"["Hello"]"#);
//!
//! // deserialization
//! let data: IntOrString = serde_json::from_str(
//! r#"{"a": 0, "b": 14}"#
//! )?;
//! println!("found {:?}", data);
//! # Ok(())
//! # }
//! ```
use serde::{Deserialize, Deserializer, Serialize, Serializer};
#[derive(serde::Serialize, serde::Deserialize)]
#[serde(untagged)]
enum Either<L, R> {
Left(L),
Right(R),
}
pub fn serialize<L, R, S>(this: &super::Either<L, R>, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
L: Serialize,
R: Serialize,
{
let untagged = match this {
super::Either::Left(left) => Either::Left(left),
super::Either::Right(right) => Either::Right(right),
};
untagged.serialize(serializer)
}
pub fn deserialize<'de, L, R, D>(deserializer: D) -> Result<super::Either<L, R>, D::Error>
where
D: Deserializer<'de>,
L: Deserialize<'de>,
R: Deserialize<'de>,
{
match Either::deserialize(deserializer) {
Ok(Either::Left(left)) => Ok(super::Either::Left(left)),
Ok(Either::Right(right)) => Ok(super::Either::Right(right)),
Err(error) => Err(error),
}
}

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//! Untagged serialization/deserialization support for Option<Either<L, R>>.
//!
//! `Either` uses default, externally-tagged representation.
//! However, sometimes it is useful to support several alternative types.
//! For example, we may have a field which is generally Map<String, i32>
//! but in typical cases Vec<String> would suffice, too.
//!
//! ```rust
//! # fn main() -> Result<(), Box<dyn std::error::Error>> {
//! use either::Either;
//! use std::collections::HashMap;
//!
//! #[derive(serde::Serialize, serde::Deserialize, Debug)]
//! #[serde(transparent)]
//! struct IntOrString {
//! #[serde(with = "either::serde_untagged_optional")]
//! inner: Option<Either<Vec<String>, HashMap<String, i32>>>
//! };
//!
//! // serialization
//! let data = IntOrString {
//! inner: Some(Either::Left(vec!["Hello".to_string()]))
//! };
//! // notice: no tags are emitted.
//! assert_eq!(serde_json::to_string(&data)?, r#"["Hello"]"#);
//!
//! // deserialization
//! let data: IntOrString = serde_json::from_str(
//! r#"{"a": 0, "b": 14}"#
//! )?;
//! println!("found {:?}", data);
//! # Ok(())
//! # }
//! ```
use serde::{Deserialize, Deserializer, Serialize, Serializer};
#[derive(Serialize, Deserialize)]
#[serde(untagged)]
enum Either<L, R> {
Left(L),
Right(R),
}
pub fn serialize<L, R, S>(
this: &Option<super::Either<L, R>>,
serializer: S,
) -> Result<S::Ok, S::Error>
where
S: Serializer,
L: Serialize,
R: Serialize,
{
let untagged = match this {
Some(super::Either::Left(left)) => Some(Either::Left(left)),
Some(super::Either::Right(right)) => Some(Either::Right(right)),
None => None,
};
untagged.serialize(serializer)
}
pub fn deserialize<'de, L, R, D>(deserializer: D) -> Result<Option<super::Either<L, R>>, D::Error>
where
D: Deserializer<'de>,
L: Deserialize<'de>,
R: Deserialize<'de>,
{
match Option::deserialize(deserializer) {
Ok(Some(Either::Left(left))) => Ok(Some(super::Either::Left(left))),
Ok(Some(Either::Right(right))) => Ok(Some(super::Either::Right(right))),
Ok(None) => Ok(None),
Err(error) => Err(error),
}
}